Texture formation in bulk iron processed by simple shear
- Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
- Oak Ridge National Lab., TN (United States). High Temperature Materials Lab.
The preferred orientation of grains in iron after conventional deformation by cold rolling or drawing is characterized as sheet or fiber texture respectively. The main texture component in the rolling direction is [110](001). For the case of wire drawing, again, the [110] direction aligns with the wire axis. A novel method of straining materials called equal channel angular extrusion (ECAE), has recently been developed. This new processing method has the capability of introducing large amounts of plastic strain into bulk material in a relatively uniform manner without a reduction in workpiece cross-section. The processing concept is elegant; press a block of solid material through a constant cross-section tunnel composed of two intersecting channels. The purpose of the work reported here is to determine which kinds of texture are developed by three basic schemes of multipass ECAE. The schemes examined include what are termed route A, route B and route C. Route A maintains the same orientation of the shear plane and shear direction relative to the extrusion direction during all extrusions. Route B involves rotating the billet +90{degree} about the extrusion direction before each even numbered extrusion and {minus}90{degree} before each odd numbered extrusion. Route C processing includes an even number of extrusion passes with a +180{degree} or {minus}180{degree} rotation of the workpiece around the extrusion direction before each extrusion. Conventional sheet and fiber textures can be developed in bulk iron by using multipass ECAE processing. A shear texture results after a single extrusion. Multipass extrusions that return structural elements to their original shape after an even number of passes result in a texture that shows characteristics of both shear and the original texture.
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 305426
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 12; Other Information: PBD: 13 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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